JP4590697B2 - Cutting edge position adjusting method and apparatus - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method and an apparatus for automatically adjusting a blade edge position in a machine tool.
[0002]
[Prior art]
In boring, the cutting edge position may deviate from the reference position due to cutting edge wear caused by the machining. For this reason, it has been widely practiced to adjust (correct) the blade tool by attaching it to the tip of the spindle so as to be movable in the radial direction and turning the adjustment shaft provided at the tip of the spindle. . For example, in Japanese Patent Laid-Open No. 10-15712, a spindle is rotatably provided on a spindle head of a machine tool that moves up and down, and an adjustment shaft (draw bar) is rotated to a position eccentric from the spindle axis on a tool holder that is detachable at the tip of the spindle. The drive shaft of the rotary drive device provided on the table that moves back and forth and left and right is fitted in the hexagonal hole at the tip of the draw bar, and the drive shaft is rotated by the servo motor of the rotary drive device. A tool for moving a cutting tool provided in a tool holder in a radial direction via the transmission mechanism is disclosed.
[0003]
[Problems to be solved by the invention]
According to the above, in order to rotate the adjustment axis of the tool holder, the rotary drive device incorporating the dedicated servo motor for rotating the draw bar for adjusting the blade position of the tool holder is provided on the table of the machine tool. Therefore, there is a problem that the device becomes expensive. An object of the present invention is to make it possible to provide the apparatus at a low cost by performing the blade edge position adjustment as described above by using a drive motor originally provided in a machine tool.
[0004]
[Means for Solving the Problems]
Because of the problems solved, in the present application, the workpiece, X, Y, and controls the Z-axis driving motor, in a machine tool for machining by the spindle tip of the cutting tool, offset from the spindles rotation axis to the spindle tip This is a blade edge position adjusting method for adjusting the radial blade edge position of a cutting tool that is provided with a rotatable adjustment shaft at the position and rotating the adjustment shaft so that the spindle tip can be displaced in the radial direction. The machine tool is provided with a rotation preventing member that engages and disengages with the adjustment shaft, and the spindle head or the disengagement member is moved by the X and Y axis drive motors so that the adjustment shaft and the spindle are relatively moved around the axis of the adjustment shaft. The blade tip position of the blade tool is adjusted by turning (claim 1). Further, in the present application, an adjustment shaft is rotatably provided at a position eccentric from the spindle rotation axis at the spindle tip, and the adjustment shaft is rotated so as to be displaceable in the radial direction at the spindle tip. In the blade edge position adjusting method for adjusting the blade edge position in the radial direction of the cutting tool, the spindle is rotatably provided on a spindle head that moves in two directions perpendicular to the spindle rotation axis, and the tip of the adjustment shaft is held by the rotation prevention member on the fixed side The blade tip position of the cutting tool is adjusted by rotating the spindle relative to the tip of the spindle by rotating the spindle by movement control of the spindle head in two orthogonal axes around the axis of the adjustment shaft. (Claim 2).
[0005]
The device of the present application is a machine tool that controls the X, Y, and Z axis drive motors on a workpiece to perform machining with a cutting tool at the tip of the spindle, and rotatably supports the spindle on the spindle head. The tool holder is detachably attached to the tip, and the tool holder is provided with an adjustment shaft rotatably at a position eccentric from the spindle rotation axis , a gradient surface provided on the inner surface of the tip of the tool holder body, the front end inclined surface provided in the slide body guided in contact, regulating Seijiku by rotating the radial blade which is provided so as to be positioned displaced body of elastically deforming in the radial direction to the tool holder in machine tool that is configured to adjust the blade position, a slit is provided on the inner surface of the longitudinal substantially central portion of the main body, biasing the adjusting shaft and the slide member is screwed forward in the spring, A rotation prevention member that engages and disengages with the adjustment shaft is provided on the fixed side of the machine, and the spindle head is moved in the X and Y axis directions perpendicular to the spindle axis by the X and Y axis drive motors. Control means for controlling the spindle head in the X and Y axis directions while the adjustment shaft is locked to turn the spindle about the axis of the adjustment shaft is provided. In order to carry out the method of claim 1, instead of moving the spindle head in the X and Y axis directions by the X and Y axis drive motors in this way, a rotation preventing member that engages and disengages with the adjustment shaft is provided. The X and Y axis drive motors may be moved in the X and Y axis directions, the spindle head is moved in the X axis direction by the X axis drive motor, and the rotation preventing member is moved in the Y axis direction by the Y axis drive motor. The relative rotation of the adjusting shaft and the spindle may be realized by moving them and combining them. A locking portion is provided at the tip of the adjustment shaft, and the rotation preventing member is a locking / disengaging member that locks and locks the locking portion by engaging / disengaging the locking portion from the spindle axis direction.
With these configurations, the adjustment shaft and the spindle are rotated relative to each other by the X-axis and Y-axis drive sources inherent to the machine tool. Is not necessary, and it becomes inexpensive.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
1 and 2, the moving base 2 on the main body bed 1 is moved in the front-rear (Z-axis) direction by a feed screw shaft 4 that is rotationally driven by a Z-axis drive motor 3 attached to the rear portion of the main body bed 1. is there. On the moving base 2, the moving column 5 is moved in the left-right (X-axis) direction by a feed screw shaft 7 that is rotationally driven by an X-axis driving motor 6 attached to the side of the moving base 2. As a result, the moving column 5 moves horizontally back and forth and left and right. A spindle head 8 that rotatably supports a spindle 8a is mounted on the movable column 5 so as to be movable in the vertical (Y-axis) direction. The spindle head 8 is moved up and down by the upper and lower feed screw shafts 9 in the moving column 5, and the feed screw shaft 9 is connected to the moving column 5 via the Y-axis drive motor 10 and the timing belt 11 mounted with the output shaft facing upward. Connected. The spindle 8a is rotationally driven by a spindle rotation motor M with a brake.
[0007]
Four support columns 12 are erected from the main body bed 1, and a magazine support base 13 is fixed to the upper end of the support column and is positioned above the horizontal movement space of the moving column 5. An arm device 15 is integrally mounted on the lower surface of the magazine support base 13 with a slight gap between the top of the movable column 5. In the arm device 15, for example, as disclosed in Japanese Patent Laid-Open No. 62-282840, a tool change arm 17 having gripping portions 16 at both ends is turned 90 ° clockwise from the standby position shown in FIG. Then, the tool holder 25 at the delivery position B of the transfer device 50 described later and the tool holder of the spindle (the tools are mounted on them) are gripped at the same time, and then the tool change arm 17 is moved in the axial direction to move both tools. The holder 25 is pulled out and turned 180 degrees, then moved back in the axial direction to change the tool, and then turned 90 ° counterclockwise to return to the original standby position.
[0008]
A magazine base 20 in which four support columns 18 and a base plate 19 are combined is fixed on the upper surface of the magazine support base 13, and a tool magazine 30 is divided on the magazine base 20 by a known geneva mechanism (not shown) by motor rotation. Equipped with free access. A large number of tool holders 25 holding tools are detachably held on a magazine plate 31 that is pivotally indexed in the tool magazine 30. The tool holder 25 includes a tool holder 60 described later having a blade edge position adjusting function.
[0009]
Between the tool magazine 30 and the tool changer arm 17, a tool holder 25 at the indexing position of the tool magazine 30 (vertically downward position in this embodiment, position A in FIG. 1) is provided inside the magazine base 20. A transfer device 50 for transferring to the delivery position B to be transferred to the tool changing arm 17 is arranged below the vertical direction.
[0010]
FIG. 3 shows a state where a tool holder 60 for adjusting the blade edge position is attached to the tip of the spindle 8a. The tool holder 60 has a structure described in, for example, Japanese Patent Laid-Open No. 10-15712, and has a tool base 63 on a main body 62 having a tapered shaft portion 61 that is removably fitted into a tapered hole 8b at the tip of a spindle 8a. A holding body 63a attached with a cutting tool T is attached to a radially outer portion of the distal end of the blade base 63, and an inner side surface of the distal end of the blade base 63 is connected to the proximal side from the distal end side. A slope surface 64 having a downward slope is provided. A slit 65 is provided on the inner surface of the substantially central portion in the longitudinal direction of the blade base 63, and when a force is applied to the inclined surface 64, the tip portion (Z-axis forward direction portion) is elastic in the radial direction from the slit 65 portion. It is designed to be deformed.
[0011]
At the front end of the main body 62 of the tool holder 60, a slide body 66 is guided by the concave guide groove 67 so as to slide back and forth only in the axial direction. The slide body 66 is provided with a slope surface 68 that contacts the slope surface 64 of the blade base 63, and is eccentric from the axis CL1 of the tool holder 60 (which coincides with the spindle 8a axis when attached to the spindle 8a). The adjustment shaft 70 is screwed to the position so as to be rotatable. A hexagonal hole 71 as a locking portion is provided at the tip of the adjustment shaft 70. The adjustment shaft 70 is rotatably supported at its end in the taper shank direction by a thrust bearing (not shown) on the main body 62. Reference numeral 72 denotes a spring that biases the slide body 66 forward, and holds the moving position of the slide body 66 so that the screw coupling between the slide body 66 and the adjustment shaft 70 is not loosened.
Accordingly, when the adjustment shaft 70 is rotated, the slide body 66 slides in the axial direction due to the screw connection between the adjustment shaft 70 and the slide body 66, and the slope surface 68 acts on the slope surface 64 in contact with the slide body 66. The front portion, that is, the blade mounting portion moves from the portion in the radial direction by elasticity, and the blade edge position is adjusted.
[0012]
On the bed 1, a hexagonal cross section that fits in and out of the spindle 8a from the axial direction as the rotation preventing member at a position in front of the moving column 5 and directly below the ATC position. The engaging / disengaging member 73 is fixedly arranged. A control device 80 for controlling the drive motors 6, 10, and 3 for the X, Y, and Z axes described above is mounted on the rear surface of the machine tool. In addition to the program, a blade edge adjustment program for adjusting the blade edge of the blade edge adjustment holder is incorporated as the blade edge position control means 81. This cutting edge position adjustment program controls the following operations.
[0013]
When the blade edge adjustment program is started with the blade edge adjustment tool holder 60 mounted on the tip of the spindle 8a, the X and Y axis drive motors 6 and 10 are driven to control the three-dimensional position of the spindle 8a, and the engagement / disengagement member. 73 and the adjustment shaft 70 are made to coincide with each other, and then the spindle 8 a is advanced in the Z-axis direction by the Z-axis drive motor 3 to fit the hexagonal hole 71 at the tip of the adjustment shaft 70 into the engagement / disengagement member 73. In this state, the brake of the spindle rotation motor M is released so that the spindle 8a is rotatable with respect to the spindle head 8, and the X and Y axis drive motors 6 and 10 are controlled to move the spindle head 8 to the X and Y positions. The movement is controlled in the axial direction, and the spindle 8a is relatively rotated along the circle C around the axis line CL2 of the adjusting shaft 70. As a result, if the turning direction is normal rotation, the slide body 66 retreats in the axial direction, and the cutting edge moves outward in the radial direction by the interaction of the gradient surfaces 64 and 68. Move inward direction. In this embodiment, the movement of the spindle 8a in the Z-axis direction has been described as the entire column 5 moving in the Z-axis direction. However, the moving column moves only in the X-axis direction, and the moving column moves to the Y-axis direction. A spindle head that is mounted so as to move in the direction may be such that the spindle moves in the Z-axis direction.
[0014]
【The invention's effect】
As described above, according to the present invention, adjustment for cutting edge position adjustment at the tip of the spindle is eccentric from the spindle rotation axis by driving with the X-axis and Y-axis drive motors originally provided for machining by the machine tool. The blade tip position of the cutting tool is adjusted by rotating the shaft and spindle relative to each other around the adjustment shaft, so no special drive source is required for blade tip position adjustment, and the configuration is simple and inexpensive. Can be implemented.
[Brief description of the drawings]
FIG. 1 is a front view of a machine tool including an apparatus of the present application.
FIG. 2 is a side view of FIG.
FIG. 3 is an enlarged view of the tip of a spindle.
4 is an enlarged view as viewed in IV of FIG. 1. FIG.
[Explanation of symbols]
3 Z-axis drive motor 6 X-axis drive motor 8 Spindle head 8a Spindle 10 Y-axis drive motor 25, 60 Tool holder
62 Body
64, 68 inclined surface
65 slits
66 Slide body 70 Adjustment shaft 71 Hexagonal hole (locking part)
72 Spring 73 Engaging / disengaging member (rotation preventing member)
81 Cutting edge position adjustment program (control means)
CL1 Spindle rotation axis CL2 Adjustment axis axis T Cutting tool

Claims (4)

The workpiece, X, Y, and controls the Z-axis driving motor, in a machine tool for machining by the spindle tip of the cutting tool, rotatably the adjusting shaft at a position eccentric from the spindles rotation axis to the spindle tip A blade edge position adjusting method for adjusting a radial blade edge position of a cutting tool provided to be displaceable in a radial direction at a spindle tip portion by rotating the adjustment shaft. a rotating blocking member to escape, X, by a Y-axis drive motor, by relative rotation about the axis of the adjusting shaft and the adjustment shaft and the spindle by moving the spindle head or disengaged member, the cutting tool A blade edge position adjusting method comprising adjusting a blade edge position. A radial cutting edge of a cutting tool that is provided at the tip of the spindle so as to be rotatable at a position that is eccentric from the spindle rotation axis and that can be displaced in the radial direction by rotating the adjustment shaft. In the blade edge position adjusting method for adjusting the position, the spindle is rotatably provided on a spindle head that moves in two directions orthogonal to the spindle rotation axis, and the axis of the adjustment shaft is held while the tip of the adjustment shaft is held by the rotation prevention member on the fixed side. the adjustment shaft by turning the spindle by relative rotation to the spindle tip in the movement control of the orthogonal two axial directions of the spindle head about, and adjusts the edge position of the cutting tool Cutting edge position adjustment method. A machine tool that controls X, Y, and Z axis drive motors on a workpiece and performs machining with a cutting tool at the tip of the spindle, and the spindle is rotatably supported by the spindle head, and the spindle has a tool holder at the tip. The tool holder is rotatably provided with an adjustment shaft at a position eccentric from the spindle rotation axis, and is guided by a gradient surface provided on the inner surface of the tip of the tool holder main body and the front end of the main body. that the slide body gradient surface with the contact, by rotating the adjustment Seijiku, adjusts the radial cutting edge position of the cutting tool main body in the radial direction to the tool holder is provided to enable positional displacement is elastically deformed in machine tool that is configured to, the slits provided on the inner side surface of the longitudinal substantially central portion of the body, the adjusting shaft and the slide member is screwed and biased forward by a spring, the fixed side of the machine tool An anti-rotation member that engages and disengages with the alignment shaft is provided, and the spindle head is moved in the X and Y axis directions perpendicular to the spindle axis by the X and Y axis drive motors, and the adjustment shaft is locked to the anti-rotation member. A cutting edge position adjusting device for a machine tool, comprising control means for controlling the spindle head in the X and Y axis directions to turn the spindle about the axis of the adjusting shaft.   The locking shaft is provided at the tip of the adjustment shaft, and the rotation preventing member is an engaging / disengaging member that engages and disengages from the engaging portion in the spindle axis direction to prevent the engaging portion from rotating. 3. The blade edge position adjusting device for a machine tool according to 3.

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